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Numéro de publicationUS5243423 A
Type de publicationOctroi
Numéro de demandeUS 07/811,805
Date de publication7 sept. 1993
Date de dépôt20 déc. 1991
Date de priorité20 déc. 1991
État de paiement des fraisCaduc
Numéro de publication07811805, 811805, US 5243423 A, US 5243423A, US-A-5243423, US5243423 A, US5243423A
InventeursJean P. DeJean, Daozheng Lu, Robert Weissman
Cessionnaire d'origineA. C. Nielsen Company
Exporter la citationBiBTeX, EndNote, RefMan
Liens externes: USPTO, Cession USPTO, Espacenet
Spread spectrum digital data transmission over TV video
US 5243423 A
Résumé
A co-channel communication system allows transmission of one or more data signals in an active or visible portion of a video raster in a manner that is imperceptible to a viewer. More particularly, the data signal is transmitted over a preselected active video lines of a video raster. In order to reduce the perceptibility of the data signal, the video lines over which the data signal is transmitted is varied according to a random sequence. In an alternate embodiment, the data is also modulated at relatively low modulation levels, for example, by converting the data signal to a spread spectrum signal.
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Revendications(17)
What is claimed and desired to be secured by Letters Patent of the United States is:
1. A co-channel communication system for transmitting one or more data signals concurrently with a raster type video signal comprising:
means for modulating said data signals;
means for pseudo randomly selecting video lines on which said data signals are to be modulated; and
means for combining said modulated data signals with said video signal on said pseudo randomly selected video lines of the video raster.
2. A co-channel communication system as recited in claim 1, wherein said modulating means includes means for converting said data signal to a spread spectrum signal.
3. A co-channel communication system as recited in claim 1, wherein said modulating means includes means for modulating said data signal according to a pseudo-random sequence.
4. A co-channel communication system as recited in claim 1, wherein said pseudo random selecting means includes means for selecting said video lines according to a pseudo-random sequence.
5. A co-channel communication system as recited in claim 1, wherein said pseudo randomly selected video lines are in an active portion of the video raster.
6. A co-channel communication system for transmitting and receiving a signal comprising a raster type video signal and a data signal comprising:
means for modulating said data signal;
means for pseudo randomly selecting video lines on which said data signal is to be modulated;
means for combining said modulating data signal and said video signal on said pseudo randomly selected video lines;
means responsive to said combining means and said pseudo randomly selecting means for transmitting said combined signal;
means for receiving said combining signal; and
means for recovering said data signal from said combined signal.
7. A co-channel communication system as recited in claim 6, wherein said modulating means includes means for modulating said data signal according to a pseudo-random sequence.
8. A co-channel communication system as recited in claim 7, wherein said randomly selected video lines are in an active area of the video raster.
9. A co-channel communication system as recited in claim 6, wherein said modulating means includes means for converting said data signal to a spread spectrum signal.
10. A co-channel communication system as recited in claim 6, further including means for retransmitting said modulated data signal.
11. A co-channel communication system as recited in claim 6, wherein said recovering means includes means for storing the digital data after a predetermined portion of said retransmitted modulated data signal has been recovered.
12. A co-channel communication system for receiving a data signal concurrently transmitted with a raster type video signal, comprising:
means for demodulating pseudo randomly selected video lines, said pseudo randomly selected video lines being selected according to a pseudo-random sequence; and
means for recovering said data signal from said pseudo randomly selected video lines.
13. A co-channel communication system as recited in claim 12, wherein said demodulating means includes means for demodulating said data signal according to a pseudo-random sequence.
14. A co-channel communication system as recited in claim 12, wherein said pseudo randomly selected video lines are in an active portion of the video raster.
15. A co-channel communication system as recited in claim 12, wherein said demodulating means includes means for demodulating a spread spectrum signal.
16. A method for transmitting one or more data signals with a raster type video signal on one or more predetermined channels in a manner such that the data is imperceptible to a viewer viewing a display of the video signal comprising the steps of:
(a) modulating the data signal;
(b) pseudo randomly selecting video lines on which to modulate the data signal; and,
(c) combining said modulated data signal with a raster type video signal on said pseudo randomly selected video lines of a video raster.
17. A method as recited in claim 16, wherein step (a) includes the step of converting said data signal to a spread spectrum signal.
Description
BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a co-channel communication system for concurrently transmitting a data signal with a video signal over a single communications channel and more particularly, to a communication system for transmitting data in an active or visible portion of a video raster in a manner that is imperceptible to a viewer.

2. Description of the Prior Art

Various communication systems are known in the art for transmitting data signals along with a video signal. Such data signals are known to be used for many different purposes, for example, program syndication verification, closed caption data and the like. These communication systems utilize various methods for transmitting such data along with the video signal. In some known systems, the data is transmitted in inactive portions of the video raster, such as during vertical blanking intervals. However, due to the increased demand for additional data, non-active portions of the video rasters are generally no longer available for data transmission. Other known systems place the data in an active portion of the video raster by modulating the data at low levels relative to the video signal. More specifically, in such systems, the data signal is normally transmitted over an active video line that appears near the top or bottom of the screen since a viewer is less likely to concentrate on a portion of the display away from the center of the screen. However, such data signals appear as noise and are still perceptible to the viewer.

Various other techniques are known for transmitting data signals along with a video signal For example, U.S. Pat. No. 3,244,808 to Roberts discloses a pulse code modulation (PCM) video communication system. In such systems, digital data is used to improve the picture quality. More specifically, in such a system, the picture quality is related to the number of bits utilized to encode the brightness level. In order to improve the picture quality in such a system while minimizing the channel bandwidth, a data signal is used to average the brightness level in a selected area of the video raster to reduce the contrast and thereby improve the picture quality. The data signal is added to the video signal by way of a pseudo-random sequence at the transmitter. The same pseudo-random sequence is used at the receiver in order to decode the data signal.

Spread spectrum techniques are also known for transmitting data over active video channels More specifically, U.S. Pat. No. 4,912,721 to Pigeon et al. discloses an interactive video communication system which utilizes spread spectrum signals for sending data from a cable TV household to a cable head end. More specifically, in such a communication system a return path is provided to allow a cable TV subscriber to communicate with a cable head end for a variety of purposes such as home shopping, voting, and the like.

U.S. Pat. No. 4,425,642 to Moses et al. discloses a co-channel communication system for transmitting a digital data signal simultaneously with a video or voice signal. The Moses et al. patent discloses the use of spread spectrum signals to transmit the digital data signal along a predetermined active video line. Although the use of spread spectrum signals greatly reduces the viewer perceptibility of the data signal, transmission of the data signal over a single active video line is still noticeable to a viewer

SUMMARY OF THE INVENTION

It is an object of the present invention to solve the problems associated with the prior art.

It is another object of the present invention to provide a communication system for simultaneously transmitting one or more data signals along active video lines.

It is yet another object of the present invention to transmit one or more data signals in an active portion of the video raster in a manner that is imperceptible to a viewer.

Briefly, the present invention relates to a co-channel communication system for transmitting data signals in an active or visible portion of a video raster in a manner that is imperceptible to a viewer. More particularly, the data signals are transmitted over preselected active video lines of the video raster. In order to reduce the perceptibility of the data signal, the selected video lines over which the data signals are transmitted are varied according to a random sequence. The data is also modulated at relatively low modulation levels, for example, by converting the data signal to a spread spectrum signal.

DESCRIPTION OF THE DRAWING

These and other objects and advantages of the present invention will become readily apparent upon consideration of the following detailed description and attached drawing, wherein:

FIG. 1 is a block diagram of a modulation circuit in accordance with the present invention.

FIG. 2 is a block diagram of a modulator which forms a part of the modulation circuit illustrated in FIG. 1.

FIG. 3 is a block diagram of a demodulation circuit in accordance with the present invention.

FIG. 4 is a block diagram of a signal recovery circuit which forms a part of the demodulation circuit illustrated in FIG. 3.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

A co-channel communication system for transmitting data, such as digital data, in an active or visible portion of the video raster is generally identified with the reference numeral 20. An important aspect of the invention is that the data is transmitted in a manner that is relatively imperceptible to the viewer. The co-channel communication system in accordance with the present invention includes one or more modulators for modulating the data along active video lines of a video raster. In order to insure that the data is relatively imperceptible to a viewer, the active video lines upon which the data is modulated are varied according to a pseudo random sequence. In an alternate embodiment of the invention, the data is modulated at relatively low modulation levels, for example, by converting the data signals to spread spectrum signals.

The co-channel communication system in accordance with the present invention includes a modulation circuit as illustrated in FIGS. 1 and 2, and a demodulation circuit as illustrated in FIGS. 3 and 4. The co-channel communication system allows encoding of data for various purposes, including programs syndication verification, copyright marking, media research, closed caption data and the like along active video lines in a non-obtrusive manner.

Referring to FIG. 1, a block diagram of the modulation circuit in accordance with the present invention is illustrated. The modulation circuit includes one or more modulators 22 and 24, as will be discussed below, as well as a video signal source 28, a sync recovery circuit 30, a digital data load circuit 32, a control circuit 34 and a mixer or summing junction 36. Horizontal and vertical sync signals are recovered from a raster type video signal, available at the video signal source 28, by way of the sync recovery circuit 30. Such horizontal and vertical sync signal recovery circuits are generally well drawn in the art.

The recovered horizontal sync and vertical sync signals are utilized by the control circuit 34 in order to synchronize the modulation of the digital data along active video lines. More specifically, in one embodiment of the invention, a separate modulator is used for each field of the video frame. In such an embodiment the horizontal and vertical sync signals are used to alternatively enable the modulators 22 and 24. The modulated data along with the composite video signal are additively combined in the signal mixer 36 and transmitted to a video signal receiver.

The digital data corresponding to program syndication verification, copyright marking, media research, closed caption data or the like, is loaded into the digital data load circuit 32 which includes a ring shift register 38 (FIG. 2), under the control of the control circuit 34. More specifically, the digital data is loaded into the ring shift register 38 (FIG. 2) which is enabled by the control circuit 34 by way of a READY TO LOAD signal. The READY TO LOAD signal is asserted initially at the beginning of the modulation and thereafter once all the data is shifted out of the ring shift register 38. After the data is loaded into the digital data load circuit 32, the digital data load circuit 32 asserts a LOAD COMPLETE signal which, in turn, is applied to the control circuit 34. After the LOAD COMPLETE signal is asserted, the control circuit 34 asserts a START MODULATION signal which is synchronized with the vertical sync signal such that the START MODULATION signal is asserted at the beginning of the first frame following the assertion of the LOAD COMPLETE signal. As will be discussed below, once all of the data is shifted out of the shift register 38 the modulation is complete and a MODULATION COMPLETE signal is asserted and applied to the control circuit 34 which, in turn, asserts a READY TO LOAD signal in order to allow additional digital data to be shifted into the digital data load circuit 32. The modulated data available on lines 40 and 42 at the output of the modulators 22 and 24 is applied to the signal mixer 36 along with the composite video signal available on line 44. The resulting signal available at the output of the signal mixer signal 36 may then be transmitted to a suitable video signal receiver, such as a television or a video cassette recorder.

As will be appreciated by those of ordinary skill, the control circuit 34 may be implemented in various ways. For example, in one embodiment, the control circuit 34 may include a microcontroller which includes a microprocessor as well as a plurality of input/output ports. In such an embodiment, the horizontal and vertical sync signals are applied to on-board time differentiators. The microcontroller, in turn, controls the loading of the data into the digital data load circuit 32 as well as control the modulators 22 and 24 in a manner as discussed above.

A modulation circuit which may be used to implement the modulators 22 and 24 is illustrated in FIG. 2, illustrated within the dashed box. The modulation circuit shown in FIG. 2 illustrates a circuit for converting the signal to a spread spectrum signal. However, it will be appreciated by those of ordinary skill in the art that other types of modulation circuits, including other types of spread spectrum circuits, are within the broad scope of the invention. Moreover, in order to transmit data on two channels, two modulators 22 and 24 are illustrated. The principles of the present invention, however, are applicable to single channel systems in which a single modulator 22 or 24 is utilized as well as various multi-channel systems utilizing more than two modulators.

The modulation circuit includes a first pseudo random generator 45 for varying the active video lines upon which the modulated data is displayed and may include a second pseudo random generator 46 for modulating the digital data at a relatively low modulation level. In addition, the modulators 22 and 24 may include a modulation complete reset counter 48, a repeat counter 50, a clock source 52, as well as an exclusive OR gate 54 for the spread spectrum modulation. As discussed above, the digital data is loaded into the ring shift register 38 under the control of the READY TO LOAD signal. Once the data is loaded into the ring shift register 38, the LOAD COMPLETE signal is asserted. The modulation is then synchronized with the horizontal and vertical sync pulses. More specifically, the START MODULATION signal is asserted by the control circuit 34 beginning with the first field after the LOAD COMPLETE signal is asserted. After the LOAD COMPLETE signal is asserted, The START MODULATION signal is then used to control the repeat counter 50 which, in turn, is used to shift data out of the ring shift register 38 where it is modulated by way of the exclusive OR gate 54 with a pseudo random sequence generated by the pseudo random generator 46. The pseudo random generator 46 is clocked by the clock source 52 which generates pulses at the video pixel frequency.

In order to improve the reliability of the data transmission, one embodiment of the invention contemplates repeating data bits. As such, multiple video lines may be used to encode a given bit and the repeated bits in the digital data stream. Accordingly, the repeat counter 50 counts the number of video lines used to encode a bit and the repeated bits. More specifically, an output of the pseudo random generator 45 which selects the video lines for displaying the digital data is applied to the repeat counter 50. The repeat counter 50 is, in turn, able to count the number of video lines used to encode a bit and the repeated bits. After a given bit and the repeated bits are encoded, the repeat counter 50 controls the ring shift register 38 in order to shift the digital data in the ring shift register 38 one bit. The repeat counter 50 also clocks the modulation complete reset counter 48 in order to count the number of bits that have been encoded.

The modulation complete reset counter 48 may be a down counter; set to the length of the digital data stream to be encoded. The counter 48 may then be decremented by one whenever a bit has been encoded as determined by the repeat counter 50. The modulation complete reset counter 48 is reset at the beginning of each field. After a given field has been encoded, the modulation complete reset counter 48 asserts the MODULATION COMPLETE signal; utilized by the control circuit 34 as discussed above.

The demodulation circuits are illustrated in FIGS. 3 and 4. More specifically, the overall block diagram for the demodulator circuit is illustrated in FIG. 3. The demodulator circuit includes a sync recovery circuit 56 for recovering the horizontal and vertical sync signals from the modulated video signal. The horizontal and vertical sync signal are applied to a demodulator control circuit 58. The demodulator control circuit 58, which may include a microcontroller, similar to the control circuit 34 as discussed above, asserts a START RECOVERY signal at the beginning the first line in a new field. The START RECOVERY signal is applied to two signal recovery circuits 60 and 62. The signal recovery circuits 60 and 62 correspond to the modulators 22 and 24, respectively and include the pseudo random sequences for both the spread spectrum modulation as well as the raster line selection.

The signal recovery circuits 60 and 62 are under the control of a free running clock 64. A horizontal sync pulse is applied to the clock 64 in order to synchronize the clock 64 with the beginning of a horizontal video line. The clock 64 runs at the video pixel frequency, similar to the clock 52 (e.g., 700 dots per line).

The modulated video signal is digitized by an analog to digital converter (ADC) 66. The output of the ADC 66 is applied to the signal recovery circuits 60 and 62. The data bit stream length is applied to each of the signal recovery circuits 60 and 62. This enables the signal recovery circuits 60 and 62 to assert a RECOVERY COMPLETE signal to the demodulator control circuit 58 whenever a particular data bit stream has been recovered.

The signal recovery circuits 60 and 62 may be implemented as illustrated in FIG. 4. The signal recovery circuits 60 and 62 include a chirp sequence shift register 68 and a raster hop shift register 70. These shift registers 68 and 70 may be shift registers which are preloaded with the pseudo random sequences generated by the pseudo random generators 45 and 46. Alternatively, the chirp sequence shift register 68 and the raster hop shift register 70 may also be pseudo random generators which generate the same sequences as the pseudo random generators 45 and 46.

The digitized video signal is applied to a digital accumulator 72 which performs the demodulation function. More specifically, the digitized video signal is added or subtracted to the running value of a digital accumulator 72 under the control of the chirp sequence shift register 68. Since both the digital accumulator 62 and chirp sequence shift register 68 are synchronized to the clock 64, an addition or subtraction operation will be performed for each clock cycle. Thus at the end of each clock cycle the digital accumulator 72 generates a sign bit which is representative of the polarity of the running sum generated by the repetititve addition/subtraction operations. The sign bit is thus representative of the decoded data signal

The raster hop shift register 70 is preloaded with the same pseudo random sequence as the pseudo random generator 45. The raster hop shift register 70 is reset by a START RECOVERY signal which, as previously mentioned, is asserted by the demodulator control circuit 58. The raster hop shift register 70 is clocked by a horizontal sync pulse which clocks the raster hop shift register 70 at the beginning of each video line. The raster hop shift register 70 is then used to control the chirp sequence shift register 68. More specifically, the chirp sequence shift register 68 is clocked by the clock 64. The raster hop shift register 70 functions to either enable or reset the chirp sequence shift register 68 according to the sequence generated by the pseudo random generator 26 under the control of the clock 64.

The chirp sequence shift register 68 generates a BEGIN CHIRP SEQUENCE signal and an END CHIRP SEQUENCE to control the demodulation of the digitized data signal. More specifically, the BEGIN CHIRP SEQUENCE signal is asserted to the digital accumulator 72 and is responsive to the START RECOVERY signal asserted by the demodulator control circuit 58 such that the BEGIN CHIRP SEQUENCE signal is asserted at the beginning of the next field in the video frame after the START RECOVERY signal is asserted by the demodulator control circuit 58. Once the chirp sequence bits are shifted out of the chirp sequence shift register 68 an END CHIRP SEQUENCE signal is asserted.

As previously mentioned, in order to improve the reliability of the data transmission, the data bits in the data bit stream may be repeated. In this embodiment of the invention a bit repeat counter 74 is utilized to count the number of bit retransmissions. More specifically, the bit repeat counter 74 is implemented as an up counter for counting the number of bit retransmissions. For example, if the digital data to be transmitted is, for example the binary number 10110110 this data could be transmitted as 111000111111000111111000. In this example, the number of bit transmissions is two. Thus the bit repeat counter 74 would be adapted to count the original bit plus two bit retransmissions. This bit repeat counter 74 is thus reset every time the START RECOVERY signal is asserted as well as after every three bit counts. The bit repeat counter 74 is incremented by the END CHIRP SEQUENCE signal asserted by the chirp sequence shift register 68 at the end of each bit time. The bit repeat counter 74 asserts an END REPEAT signal at the end of the last retransmission. As will be discussed below, the END REPEAT signal is used to control a majority selector 76.

As previously mentioned, the sign bit output from the digital accumulator 72 represents the decoded data. These sign bits are applied to a bit shift register 78. The bit shift register 78 is a shift register used to store the data bits recovered repeatedly after demodulation. The bit shift register 78 is loaded at the end of each demodulation sequence by the END CHIRP SEQUENCE signal.

The data bits including the retransmitted bits from the bit shift register 78 are applied to the majority selector 76. The majority selector 76 generates a RECOVERED BIT signal at a predetermined number which may represent the majority of the total of the bits as well as the retransmitted bits. Thus in the previous example, if each data bit is repeated twice, the majority selector would generate a RECOVERED BIT signal after three bits were recovered under the control of the END REPEAT signal asserted by the bit repeat counter 74. The recovered bits from the majority selector 76 are then shifted into a recovered data shift register 80. The recovered data shift register 80 is under the control of the END REPEAT signal such that one bit is shifted into this shift register 80 at the end of the retransmission sequence for each bit. The output of the recovered data register 80 thus represents the recovered digital data that was transmitted.

The circuitry also includes a data stream length counter 82 which may be implemented as an up counter; set to the length of the digital bit stream. This counter 82 asserts a RECOVERY COMPLETE signal when the data bit stream has been recovered which is applied to the demodulator control circuit 58 as discussed above. The data stream length counter 82 is reset by the START RECOVERY signal and also after the counter has counted up to the number of bits in the digital data stream. The data stream length counter 82 is under the control of the END REPEAT signal which increments the counter 82 after each bit as well as the retransmitted bits are recovered. Once the counter 82 is incremented to the number of bits in the digital bit stream, the RECOVERY COMPLETE signal is asserted.

Obviously, many modifications and variations of the present invention are possible in light of the above teachings. Thus, it is to be understood that, within the scope of the appended claims, the invention may be practiced otherwise than as specifically described above.

Citations de brevets
Brevet cité Date de dépôt Date de publication Déposant Titre
US3244808 *12 janv. 19625 avr. 1966Massachusetts Inst TechnologyPulse code modulation with few amplitude steps
US3562420 *12 mars 19689 févr. 1971Post OfficePseudo random quantizing systems for transmitting television signals
US3838444 *30 oct. 197224 sept. 1974Hazeltine Research IncSystem for transmitting auxiliary information in low energy density portion of color tv spectrum
US3842196 *12 nov. 197315 oct. 1974Hazeltine Research IncSystem for transmission of auxiliary information in a video spectrum
US3984624 *25 juil. 19745 oct. 1976Weston Instruments, Inc.Video system for conveying digital and analog information
US4363138 *27 nov. 19787 déc. 1982Trw Inc.Signal presence detector and method
US4425642 *8 janv. 198210 janv. 1984Applied Spectrum Technologies, Inc.Simultaneous transmission of two information signals within a band-limited communications channel
US4841545 *21 juil. 198720 juin 1989Kyocera CorporationSynchronous tracking device for direct spread spectrum receiver
US4912721 *29 avr. 198827 mars 1990Scientific-Atlanta, Inc.Cable television spread spectrum data transmission apparatus
US4969041 *23 sept. 19886 nov. 1990Dubner Computer Systems, Inc.Embedment of data in a video signal
Citations hors brevets
Référence
1 *Spread Spectrum Goes Commerical by D. L. Schilling, R. L. Pickholtz, and L. B. Mistein, IEEE Spectrum Magazine, Aug. 1990, pp. 40 46.
2Spread Spectrum Goes Commerical by D. L. Schilling, R. L. Pickholtz, and L. B. Mistein, IEEE Spectrum Magazine, Aug. 1990, pp. 40-46.
Référencé par
Brevet citant Date de dépôt Date de publication Déposant Titre
US5387941 *18 sept. 19927 févr. 1995Wavephore, Inc.Data with video transmitter
US5410360 *14 juin 199325 avr. 1995Wavephore, Inc.Timing control for injecting a burst and data into a video signal
US5550579 *7 mars 199427 août 1996Radio Telecom & Technology, Inc.Two-way cable tv conversion system
US5557333 *24 févr. 199417 sept. 1996Wavephore, Inc.System for transparent transmission and reception of a secondary data signal with a video signal in the video band
US5559559 *14 juin 199324 sept. 1996Wavephore, Inc.Transmitting a secondary signal with dynamic injection level control
US5572247 *8 avr. 19945 nov. 1996Wavephore, Inc.Processor for receiving data from a video signal
US5587743 *8 avr. 199424 déc. 1996Wavephore, Inc.Signal processors for transparent and simultaneous transmission and reception of a data signal in a video signal
US5589872 *11 sept. 199531 déc. 1996Radio Telecom & Technology, Inc.Compatible interactive TV and multimedia delivery system two-way cable TV conversion system for data transmission over a dedicated frequency band
US5596361 *11 sept. 199521 janv. 1997Radio Telecom & Technology, Inc.Two-way cable TV conversion system for data transmission over a dedicated frequency band
US5617148 *31 mars 19951 avr. 1997Wavephore, Inc.Filter by-pass for transmitting an additional signal with a video signal
US5636292 *8 mai 19953 juin 1997Digimarc CorporationSteganography methods employing embedded calibration data
US5663766 *25 janv. 19962 sept. 1997Lucent Technologies Inc.Digital data encoding in video signals using data modulated carrier signals at non-peaks in video spectra
US5666168 *8 avr. 19949 sept. 1997Wavephore, Inc.System for transmitting facsimile data in the upper vestigial chrominance sideband of a video signal
US5689587 *9 févr. 199618 nov. 1997Massachusetts Institute Of TechnologyMethod and apparatus for data hiding in images
US5710834 *8 mai 199520 janv. 1998Digimarc CorporationMethod and apparatus responsive to a code signal conveyed through a graphic image
US5731841 *25 mai 199424 mars 1998Wavephore, Inc.High performance data tuner for video systems
US5737025 *28 févr. 19957 avr. 1998Nielsen Media Research, Inc.Co-channel transmission of program signals and ancillary signals
US5737026 *7 juin 19957 avr. 1998Nielsen Media Research, Inc.Video and data co-channel communication system
US574560415 mars 199628 avr. 1998Digimarc CorporationIdentification/authentication system using robust, distributed coding
US57487638 mai 19955 mai 1998Digimarc CorporationImage steganography system featuring perceptually adaptive and globally scalable signal embedding
US57487838 mai 19955 mai 1998Digimarc CorporationMethod and apparatus for robust information coding
US576842621 oct. 199416 juin 1998Digimarc CorporationGraphics processing system employing embedded code signals
US580916012 nov. 199715 sept. 1998Digimarc CorporationMethod for encoding auxiliary data within a source signal
US5812184 *11 sept. 199522 sept. 1998Radio Telecom & Technology, Inc.Transmission of frame-to-frame reversed polarity signals in a two-way cable TV conversion system
US582243625 avr. 199613 oct. 1998Digimarc CorporationPhotographic products and methods employing embedded information
US5831679 *28 oct. 19963 nov. 1998Wavephore, Inc.Network for retrieval and video transmission of information
US583211925 sept. 19953 nov. 1998Digimarc CorporationMethods for controlling systems using control signals embedded in empirical data
US58418864 déc. 199624 nov. 1998Digimarc CorporationSecurity system for photographic identification
US5841978 *27 juil. 199524 nov. 1998Digimarc CorporationNetwork linking method using steganographically embedded data objects
US5848399 *25 juil. 19968 déc. 1998Burke; Raymond R.Computer system for allowing a consumer to purchase packaged goods at home
US58504818 mai 199515 déc. 1998Digimarc CorporationSteganographic system
US586226016 mai 199619 janv. 1999Digimarc CorporationMethods for surveying dissemination of proprietary empirical data
US5870499 *17 nov. 19979 févr. 1999Massachusetts Institute Of TechnologyMethod and apparatus for data hiding in images
US5903231 *16 déc. 199611 mai 1999Vidicast Ltd.System for encoding base N data using a multi-level coding scheme
US5912972 *26 mars 199715 juin 1999Sony CorporationMethod and apparatus for embedding authentication information within digital data
US5929920 *11 juil. 199727 juil. 1999Lucent Technologies Inc.System and method for encoding digital information in a television signal
US59303777 mai 199827 juil. 1999Digimarc CorporationMethod for image encoding
US602619316 oct. 199715 févr. 2000Digimarc CorporationVideo steganography
US6047374 *26 mai 19994 avr. 2000Sony CorporationMethod and apparatus for embedding authentication information within digital data
US6094228 *23 mars 199825 juil. 2000Ciardullo; Daniel AndrewMethod for transmitting data on viewable portion of a video signal
US6101604 *26 mai 19998 août 2000Sony CorporationMethod and apparatus for embedding authentication information within digital data
US61119548 oct. 199829 août 2000Digimarc CorporationSteganographic methods and media for photography
US6115818 *17 nov. 19985 sept. 2000Sony CorporationMethod and apparatus for embedding authentication information within digital data
US6122010 *22 juil. 199719 sept. 2000Vidicast Ltd.Television signal data transmission system
US612239212 nov. 199719 sept. 2000Digimarc CorporationSignal processing to hide plural-bit information in image, video, and audio data
US612240312 nov. 199619 sept. 2000Digimarc CorporationComputer system linked by using information in data objects
US6125172 *18 avr. 199726 sept. 2000Lucent Technologies, Inc.Apparatus and method for initiating a transaction having acoustic data receiver that filters human voice
US6163842 *26 mai 199919 déc. 2000Sony CorporationMethod and apparatus for embedding authentication information within digital data
US6201879 *9 févr. 199613 mars 2001Massachusetts Institute Of TechnologyMethod and apparatus for logo hiding in images
US620498127 févr. 199820 mars 2001Sony CorporationMethod for superimposing and detecting additional information signal, method for detecting additional information signal, device for detecting additional information signal, and device for recording information signal
US6211919 *28 mars 19973 avr. 2001Tektronix, Inc.Transparent embedment of data in a video signal
US6229572 *27 mars 20008 mai 2001Koplar Interactive International, LlcMethod for transmitting data on viewable portion of a video signal
US6246439 *17 mars 200012 juin 2001Tektronix, Inc.Transparent embedment of data in a video signal
US62664308 mars 200024 juil. 2001Digimarc CorporationAudio or video steganography
US627878123 juin 199921 août 2001Digimarc CorporationWireless telephony with steganography
US628603615 déc. 19994 sept. 2001Digimarc CorporationAudio- and graphics-based linking to internet
US628951429 mars 199911 sept. 2001Qcom Tv, Inc.System and method for the near-real time capture and reporting of large population consumer behaviors concerning television use
US630136910 janv. 20019 oct. 2001Digimarc CorporationImage marking to permit later identification
US63175053 nov. 199913 nov. 2001Digimarc CorporationImage marking with error correction
US63245736 août 199827 nov. 2001Digimarc CorporationLinking of computers using information steganographically embedded in data objects
US633033513 janv. 200011 déc. 2001Digimarc CorporationAudio steganography
US634313829 juin 199929 janv. 2002Digimarc CorporationSecurity documents with hidden digital data
US636315917 nov. 199926 mars 2002Digimarc CorporationConsumer audio appliance responsive to watermark data
US638134117 nov. 199930 avr. 2002Digimarc CorporationWatermark encoding method exploiting biases inherent in original signal
US6388712 *19 mars 199814 mai 2002Kabushiki Kaisha ToshibaSystem for verifying broadcast of a commercial message
US6389055 *30 mars 199814 mai 2002Lucent Technologies, Inc.Integrating digital data with perceptible signals
US6389137 *15 oct. 199714 mai 2002Sony CorporationVideo signal transmitting method, video signal output device, video signal receiver, video anti-duplication control system, additional information superimposing and extracting system and video signal recording medium
US640082729 juin 19994 juin 2002Digimarc CorporationMethods for hiding in-band digital data in images and video
US640489824 juin 199911 juin 2002Digimarc CorporationMethod and system for encoding image and audio content
US640808230 nov. 199918 juin 2002Digimarc CorporationWatermark detection using a fourier mellin transform
US640833129 sept. 199918 juin 2002Digimarc CorporationComputer linking methods using encoded graphics
US641172520 juin 200025 juin 2002Digimarc CorporationWatermark enabled video objects
US64247258 mai 200023 juil. 2002Digimarc CorporationDetermining transformations of media signals with embedded code signals
US643030210 janv. 20016 août 2002Digimarc CorporationSteganographically encoding a first image in accordance with a second image
US643823117 août 200020 août 2002Digimarc CorporationEmulsion film media employing steganography
US644937929 févr. 200010 sept. 2002Digimarc CorporationVideo steganography methods avoiding introduction of fixed pattern noise
US645980311 avr. 20011 oct. 2002Digimarc CorporationMethod for encoding auxiliary data within a source signal
US649659129 juin 199917 déc. 2002Digimarc CorporationVideo copy-control with plural embedded signals
US65227701 août 200018 févr. 2003Digimarc CorporationManagement of documents and other objects using optical devices
US652311414 mars 200018 févr. 2003Sony CorporationMethod and apparatus for embedding authentication information within digital data
US653909517 nov. 199925 mars 2003Geoffrey B. RhoadsAudio watermarking to convey auxiliary control information, and media embodying same
US654262027 juil. 20001 avr. 2003Digimarc CorporationSignal processing to hide plural-bit information in image, video, and audio data
US655312928 avr. 200022 avr. 2003Digimarc CorporationComputer system linked by using information in data objects
US6556247 *30 déc. 199929 avr. 2003Microsoft CorporationMethod and system for decoding data in the horizontal overscan portion of a video signal
US656034928 déc. 19996 mai 2003Digimarc CorporationAudio monitoring using steganographic information
US656753327 avr. 200020 mai 2003Digimarc CorporationMethod and apparatus for discerning image distortion by reference to encoded marker signals
US65677809 avr. 200220 mai 2003Digimarc CorporationAudio with hidden in-band digital data
US65743503 févr. 20003 juin 2003Digimarc CorporationDigital watermarking employing both frail and robust watermarks
US657774628 déc. 199910 juin 2003Digimarc CorporationWatermark-based object linking and embedding
US658782117 nov. 19991 juil. 2003Digimarc CorpMethods for decoding watermark data from audio, and controlling audio devices in accordance therewith
US659099619 avr. 20008 juil. 2003Digimarc CorporationColor adaptive watermarking
US65909981 août 20018 juil. 2003Digimarc CorporationNetwork linking method using information embedded in data objects that have inherent noise
US660891929 févr. 200019 août 2003Digimarc CorporationMethod and apparatus for encoding paper with information
US661160715 mars 200026 août 2003Digimarc CorporationIntegrating digital watermarks in multimedia content
US661491414 févr. 20002 sept. 2003Digimarc CorporationWatermark embedder and reader
US661491513 juin 20022 sept. 2003Digimarc CorporationImage capture and marking
US662529710 févr. 200023 sept. 2003Digimarc CorporationSelf-orienting watermarks
US662880112 oct. 199930 sept. 2003Digimarc CorporationImage marking with pixel modification
US66366153 nov. 199921 oct. 2003Digimarc CorporationMethods and systems using multiple watermarks
US66471298 mai 200211 nov. 2003Digimarc CorporationMethod and system for encoding image and audio content
US66471303 juil. 200211 nov. 2003Digimarc CorporationPrintable interfaces and digital linking with embedded codes
US665448025 mars 200225 nov. 2003Digimarc CorporationAudio appliance and monitoring device responsive to watermark data
US6661905 *27 mars 20009 déc. 2003Koplar Interactive Systems International LlcMethod for transmitting data on a viewable portion of a video signal
US667514631 mai 20016 janv. 2004Digimarc CorporationAudio steganography
US668102819 mai 199920 janv. 2004Digimarc CorporationPaper-based control of computer systems
US66810296 juil. 200020 janv. 2004Digimarc CorporationDecoding steganographic messages embedded in media signals
US66940428 avr. 200217 févr. 2004Digimarc CorporationMethods for determining contents of media
US66940438 avr. 200217 févr. 2004Digimarc CorporationMethod of monitoring print data for text associated with a hyperlink
US670099029 sept. 19992 mars 2004Digimarc CorporationDigital watermark decoding method
US670405830 déc. 19999 mars 2004Microsoft CorporationSystem and method of adaptive timing estimation for horizontal overscan data
US67180477 août 20026 avr. 2004Digimarc CorporationWatermark embedder and reader
US67214402 juil. 200113 avr. 2004Digimarc CorporationLow visibility watermarks using an out-of-phase color
US67283907 déc. 200127 avr. 2004Digimarc CorporationMethods and systems using multiple watermarks
US674218830 juin 199725 mai 2004Microsoft CorporationMethod and system for encoding data in the horizontal overscan portion of a video signal
US67449067 déc. 20011 juin 2004Digimarc CorporationMethods and systems using multiple watermarks
US675132014 juin 200115 juin 2004Digimarc CorporationMethod and system for preventing reproduction of professional photographs
US675740610 janv. 200129 juin 2004Digimarc CorporationSteganographic image processing
US676046317 janv. 20016 juil. 2004Digimarc CorporationWatermarking methods and media
US67688094 févr. 200327 juil. 2004Digimarc CorporationDigital watermark screening and detection strategies
US67753926 avr. 200010 août 2004Digimarc CorporationComputer system linked by using information in data objects
US677868231 juil. 200217 août 2004Digimarc CorporationRedundantly embedding auxiliary data in source signals
US678880025 juil. 20007 sept. 2004Digimarc CorporationAuthenticating objects using embedded data
US680437628 mars 200212 oct. 2004Digimarc CorporationEquipment employing watermark-based authentication function
US68043772 avr. 200212 oct. 2004Digimarc CorporationDetecting information hidden out-of-phase in color channels
US68230752 févr. 200123 nov. 2004Digimarc CorporationAuthentication watermarks for printed objects and related applications
US682936824 janv. 20017 déc. 2004Digimarc CorporationEstablishing and interacting with on-line media collections using identifiers in media signals
US687970129 sept. 199912 avr. 2005Digimarc CorporationTile-based digital watermarking techniques
US693728930 déc. 199930 août 2005Microsoft CorporationMethod and system for downloading and storing interactive device content using the horizontal overscan portion of a video signal
US694429831 mai 200013 sept. 2005Digimare CorporationSteganographic encoding and decoding of auxiliary codes in media signals
US6977691 *14 août 200020 déc. 2005Texas Instruments IncorporatedSystem for nonlinear viewing of television show segments
US705020114 août 200323 mai 2006Digimarc CorporationMethod and apparatus for encoding paper with information
US70510869 mars 200123 mai 2006Digimarc CorporationMethod of linking on-line data to printed documents
US705446516 oct. 200230 mai 2006Digimarc CorporationData hiding method and system for embedding and extracting information in signals
US705766619 juin 20016 juin 2006Harris CorporationSystem and method for encoding information into a video signal
US706207021 oct. 200413 juin 2006Digimarc CorporationImage marking adapted to the image
US70688127 mars 200527 juin 2006Digimarc CorporationDecoding hidden data from imagery
US709587418 févr. 200322 août 2006Wistaria Trading, Inc.Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data
US7099379 *7 juil. 200429 août 2006Custom One Design, Inc.Systems and methods for spread spectrum communication of supplemental information
US710745122 févr. 200112 sept. 2006Wistaria Trading, Inc.Optimization methods for the insertion, protection, and detection of digital watermarks in digital data
US711116821 févr. 200119 sept. 2006Digimarc CorporationDigital watermarking systems
US711361417 sept. 200226 sept. 2006Digimarc CorporationEmbedding auxiliary signals with multiple components into media signals
US7116374 *9 juil. 20043 oct. 2006Koplar Interactive Systems International, L.L.C.Method and system for enhanced modulation of video signals
US71365037 mars 200514 nov. 2006Digimarc CorporationEncoding hidden data
US715002830 déc. 199912 déc. 2006Microsoft CorporationMethod and system for downloading, storing and displaying coupon data using the horizontal overscan portion of a video signal
US715216230 déc. 200419 déc. 2006Wistaria Trading, Inc.Z-transform implementation of digital watermarks
US717101815 mai 200230 janv. 2007Digimarc CorporationPortable devices and methods employing digital watermarking
US718094220 déc. 200220 févr. 2007Dotcast, Inc.Joint adaptive optimization of soft decision device and feedback equalizer
US722481921 oct. 200229 mai 2007Digimarc CorporationIntegrating digital watermarks in multimedia content
US724279022 déc. 200510 juil. 2007Digimarc CorporationVideo steganography
US724871727 juil. 200524 juil. 2007Digimarc CorporationSecuring media content with steganographic encoding
US728067228 sept. 20069 oct. 2007Digimarc CorporationImage data processing
US728618817 août 200623 oct. 2007Koplar Interactive Systems International, L.L.C.Method and system for enhanced modulation of video signals
US728727517 avr. 200323 oct. 2007Moskowitz Scott AMethods, systems and devices for packet watermarking and efficient provisioning of bandwidth
US730811026 févr. 200311 déc. 2007Digimarc CorporationMethods for marking images
US7333153 *9 août 200219 févr. 2008Dotcast, Inc.Expanded information capacity for existing communication transmission systems
US73434925 oct. 200511 mars 2008Wistaria Trading, Inc.Method and system for digital watermarking
US73464727 sept. 200018 mars 2008Blue Spike, Inc.Method and device for monitoring and analyzing signals
US73595287 févr. 200715 avr. 2008Digimarc CorporationMonitoring of video or audio based on in-band and out-of-band data
US73627752 juil. 199622 avr. 2008Wistaria Trading, Inc.Exchange mechanisms for digital information packages with bandwidth securitization, multichannel digital watermarks, and key management
US73627817 août 200122 avr. 2008Digimarc CorporationWireless methods and devices employing steganography
US737607312 déc. 200120 mai 2008Ecd Systems, Inc.Optical storage medium having distortion regions, and a method of modifying an optical storage medium to include distortion regions
US74090737 juil. 20065 août 2008Wistaria Trading, Inc.Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data
US741512910 juil. 200719 août 2008Digimarc CorporationProviding reports associated with video and audio content
US74579622 août 200625 nov. 2008Wistaria Trading, IncOptimization methods for the insertion, protection, and detection of digital watermarks in digitized data
US746072629 mai 20072 déc. 2008Digimarc CorporationIntegrating steganographic encoding in multimedia content
US74752464 août 20006 janv. 2009Blue Spike, Inc.Secure personal content server
US747732011 mai 200513 janv. 2009Buresift Data Ltd. LlcMethod and system for downloading and storing interactive device content using the horizontal overscan portion of a video signal
US749956622 juil. 20053 mars 2009Digimarc CorporationMethods for steganographic encoding media
US75227286 janv. 200021 avr. 2009Digimarc CorporationWireless methods and devices employing steganography
US753010210 sept. 20075 mai 2009Moskowitz Scott AMethods, systems and devices for packet watermarking and efficient provisioning of bandwidth
US753272529 déc. 200612 mai 2009Blue Spike, Inc.Systems and methods for permitting open access to data objects and for securing data within the data objects
US75365553 janv. 200619 mai 2009Digimarc CorporationMethods for audio watermarking and decoding
US754595114 nov. 20059 juin 2009Digimarc CorporationData transmission by watermark or derived identifier proxy
US75623961 févr. 200214 juil. 2009Ecd Systems, Inc.Systems and methods for media authentication
US756499224 oct. 200821 juil. 2009Digimarc CorporationContent identification through deriving identifiers from video, images and audio
US756768625 oct. 200528 juil. 2009Digimarc CorporationHiding and detecting messages in media signals
US756810023 juil. 199728 juil. 2009Wistaria Trading, Inc.Steganographic method and device
US757727322 déc. 200518 août 2009Digimarc CorporationSteganographically encoded video, deriving or calculating identifiers from video, and related methods
US758048219 févr. 200425 août 2009Endres Thomas JJoint, adaptive control of equalization, synchronization, and gain in a digital communications receiver
US758654131 mars 20058 sept. 2009Koplar Interactive Systems International, L.L.C.Method and system for enhanced modulation of video signals
US758760114 juin 20058 sept. 2009Digimarc CorporationDigital watermarking methods and apparatus for use with audio and video content
US76029775 oct. 200613 oct. 2009Digimarc CorporationDigital watermarks
US76029782 déc. 200813 oct. 2009Digimarc CorporationDeriving multiple identifiers from multimedia content
US760639014 août 200820 oct. 2009Digimarc CorporationProcessing data representing video and audio and methods and apparatus related thereto
US762025317 nov. 200817 nov. 2009Digimarc CorporationSteganographic systems and methods
US76433935 févr. 20045 janv. 2010Ecd Systems, Inc.Systems and methods for optical media modification
US764364913 déc. 20055 janv. 2010Digimarc CorporationIntegrating digital watermarks in multimedia content
US764750215 nov. 200612 janv. 2010Wistaria Trading, Inc.Optimization methods for the insertion, protection, and detection of digital watermarks in digital data
US76475037 sept. 200712 janv. 2010Wistaria Trading, Inc.Optimization methods for the insertion, projection, and detection of digital watermarks in digital data
US76500097 mai 200819 janv. 2010Digimarc CorporationControlling use of audio or image content
US766070026 déc. 20079 févr. 2010Blue Spike, Inc.Method and device for monitoring and analyzing signals
US766417514 juin 200516 févr. 2010Koplar Interactive Systems International, L.L.C.Mark-based content modulation and detection
US766426325 juin 200316 févr. 2010Moskowitz Scott AMethod for combining transfer functions with predetermined key creation
US766426412 sept. 200616 févr. 2010Blue Spike, Inc.Utilizing data reduction in steganographic and cryptographic systems
US766495831 août 200716 févr. 2010Wistaria Trading, Inc.Optimization methods for the insertion, protection and detection of digital watermarks in digital data
US76724779 sept. 20082 mars 2010Digimarc CorporationDetecting hidden auxiliary code signals in media
US767605922 mai 20079 mars 2010Digimarc CorporationVideo steganography or encoding
US7679678 *28 févr. 200116 mars 2010Sony CorporationData processing device and method, and recording medium and program
US769272330 août 20076 avr. 2010Koplar Interactive Systems International L.L.C.Method and system for enhanced modulation of video signals
US769396514 oct. 20086 avr. 2010Digimarc CorporationAnalyzing audio, including analyzing streaming audio signals
US769488723 déc. 200413 avr. 2010L-1 Secure Credentialing, Inc.Optically variable personalized indicia for identification documents
US77025112 févr. 200720 avr. 2010Digimarc CorporationWatermarking to convey auxiliary information, and media embodying same
US771114311 déc. 20074 mai 2010Digimarc CorporationMethods for marking images
US771267329 sept. 200411 mai 2010L-L Secure Credentialing, Inc.Identification document with three dimensional image of bearer
US77154462 févr. 200711 mai 2010Digimarc CorporationWireless methods and devices employing plural-bit data derived from audio information
US77164855 févr. 200411 mai 2010Sca Ipla Holdings Inc.Systems and methods for media authentication
US772804830 sept. 20031 juin 2010L-1 Secure Credentialing, Inc.Increasing thermal conductivity of host polymer used with laser engraving methods and compositions
US77303172 nov. 20061 juin 2010Wistaria Trading, Inc.Linear predictive coding implementation of digital watermarks
US773865921 févr. 200615 juin 2010Moskowitz Scott AMultiple transform utilization and application for secure digital watermarking
US774400116 nov. 200429 juin 2010L-1 Secure Credentialing, Inc.Multiple image security features for identification documents and methods of making same
US774400211 mars 200529 juin 2010L-1 Secure Credentialing, Inc.Tamper evident adhesive and identification document including same
US775158816 déc. 20086 juil. 2010Digimarc CorporationError processing of steganographic message signals
US77562906 mai 200813 juil. 2010Digimarc CorporationDetecting embedded signals in media content using coincidence metrics
US776090228 mai 200420 juil. 2010Digimarc CorporationContent objects with computer instructions steganographically encoded therein, and associated methods
US77617127 févr. 200520 juil. 2010Wistaria Trading, Inc.Steganographic method and device
US777001726 déc. 20073 août 2010Wistaria Trading, Inc.Method and system for digital watermarking
US777377022 avr. 200810 août 2010Digimarc CorporationSubstituting or replacing components in media objects based on steganographic encoding
US77792613 janv. 200717 août 2010Wistaria Trading, Inc.Method and system for digital watermarking
US778765322 oct. 200731 août 2010Digimarc CorporationMethods for controlling rendering of images and video
US77893115 juin 20077 sept. 2010L-1 Secure Credentialing, Inc.Three dimensional data storage
US779384624 déc. 200214 sept. 2010L-1 Secure Credentialing, Inc.Systems, compositions, and methods for full color laser engraving of ID documents
US779841320 juin 200621 sept. 2010L-1 Secure Credentialing, Inc.Covert variable information on ID documents and methods of making same
US780498226 nov. 200328 sept. 2010L-1 Secure Credentialing, Inc.Systems and methods for managing and detecting fraud in image databases used with identification documents
US781350630 mars 200912 oct. 2010Blue Spike, IncSystem and methods for permitting open access to data objects and for securing data within the data objects
US78221977 sept. 200726 oct. 2010Wistaria Trading, Inc.Optimization methods for the insertion, protection, and detection of digital watermarks in digital data
US782402912 mai 20032 nov. 2010L-1 Secure Credentialing, Inc.Identification card printer-assembler for over the counter card issuing
US783091523 janv. 20089 nov. 2010Wistaria Trading, Inc.Methods and systems for managing and exchanging digital information packages with bandwidth securitization instruments
US784407430 juin 200830 nov. 2010Wistaria Trading, Inc.Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data
US787039321 août 200711 janv. 2011Wistaria Trading, Inc.Steganographic method and device
US787760912 nov. 200925 janv. 2011Wistaria Trading, Inc.Optimization methods for the insertion, protection, and detection of digital watermarks in digital data
US793054515 nov. 200619 avr. 2011Wistaria Trading, Inc.Optimization methods for the insertion, protection, and detection of digital watermarks in digital data
US793690020 oct. 20093 mai 2011Digimarc CorporationProcessing data representing video and audio and methods related thereto
US794480617 avr. 200817 mai 2011Sca Ipla Holdings Inc.Method for modifying optical path on optical recording medium having distortion regions
US794578130 mars 200017 mai 2011Digimarc CorporationMethod and systems for inserting watermarks in digital signals
US794949422 déc. 200924 mai 2011Blue Spike, Inc.Method and device for monitoring and analyzing signals
US795398110 août 200931 mai 2011Wistaria Trading, Inc.Optimization methods for the insertion, protection, and detection of digital watermarks in digital data
US796194912 oct. 200914 juin 2011Digimarc CorporationExtracting multiple identifiers from audio and video content
US796344924 juin 201021 juin 2011L-1 Secure CredentialingTamper evident adhesive and identification document including same
US79658649 juin 200921 juin 2011Digimarc CorporationData transmission by extracted or calculated identifying data
US797016721 juil. 200928 juin 2011Digimarc CorporationDeriving identifying data from video and audio
US79744953 août 20095 juil. 2011Digimarc CorporationIdentification and protection of video
US797887622 sept. 200912 juil. 2011Digimarc CorporationHiding codes in input data
US798059614 janv. 201019 juil. 2011L-1 Secure Credentialing, Inc.Increasing thermal conductivity of host polymer used with laser engraving methods and compositions
US798684517 nov. 200926 juil. 2011Digimarc CorporationSteganographic systems and methods
US798709420 févr. 200726 juil. 2011Digimarc CorporationAudio encoding to convey auxiliary information, and decoding of same
US798724526 nov. 200826 juil. 2011Digimarc CorporationInternet linking from audio
US79873719 juil. 200826 juil. 2011Wistaria Trading, Inc.Optimization methods for the insertion, protection, and detection of digital watermarks in digital data
US799118831 août 20072 août 2011Wisteria Trading, Inc.Optimization methods for the insertion, protection, and detection of digital watermarks in digital data
US80106326 avr. 201030 août 2011Digimarc CorporationSteganographic encoding for video and images
US801455717 juin 20046 sept. 2011Digimarc CorporationWatermarking electronic text documents
US802369215 avr. 200820 sept. 2011Digimarc CorporationApparatus and methods to process video or audio
US802369513 avr. 201020 sept. 2011Digimarc CorporationMethods for analyzing electronic media including video and audio
US802523924 juin 201027 sept. 2011L-1 Secure Credentialing, Inc.Multiple image security features for identification documents and methods of making same
US802751013 juil. 201027 sept. 2011Digimarc CorporationEncoding and decoding media signals
US803642010 août 201011 oct. 2011Digimarc CorporationSubstituting or replacing components in sound based on steganographic encoding
US804684121 août 200725 oct. 2011Wistaria Trading, Inc.Steganographic method and device
US805129419 mai 20091 nov. 2011Digimarc CorporationMethods for audio watermarking and decoding
US805501228 juil. 20098 nov. 2011Digimarc CorporationHiding and detecting messages in media signals
US806867920 avr. 201029 nov. 2011Digimarc CorporationAudio and video signal processing
US807319315 sept. 20096 déc. 2011Digimarc CorporationMethods and systems for steganographic processing
US80739336 avr. 20106 déc. 2011Digimarc CorporationAudio processing
US807869727 sept. 201013 déc. 2011Digimarc CorporationNetwork linking methods and apparatus
US809494918 mai 200010 janv. 2012Digimarc CorporationMusic methods and systems
US809579815 mars 201010 janv. 2012Sca Ipla Holdings Inc.Systems and methods for media authentication
US809940330 mars 201017 janv. 2012Digimarc CorporationContent identification and management in content distribution networks
US810354225 oct. 200024 janv. 2012Digimarc CorporationDigitally marked objects and promotional methods
US81038798 sept. 200924 janv. 2012Digimarc CorporationProcessing audio or video content with multiple watermark layers
US810407923 mars 200924 janv. 2012Moskowitz Scott AMethods, systems and devices for packet watermarking and efficient provisioning of bandwidth
US81076745 janv. 201031 janv. 2012Digimarc CorporationSynchronizing rendering of multimedia content
US811651619 janv. 201014 févr. 2012Digimarc CorporationControlling use of audio or image content
US812134310 oct. 201021 févr. 2012Wistaria Trading, IncOptimization methods for the insertion, protection, and detection of digital watermarks in digitized data
US814492419 juil. 201027 mars 2012Digimarc CorporationContent objects with computer instructions steganographically encoded therein, and associated methods
US815003231 août 20103 avr. 2012Digimarc CorporationMethods for controlling rendering of images and video
US816024922 déc. 200917 avr. 2012Blue Spike, Inc.Utilizing data reduction in steganographic and cryptographic system
US816128621 juin 201017 avr. 2012Wistaria Trading, Inc.Method and system for digital watermarking
US81715619 oct. 20081 mai 2012Blue Spike, Inc.Secure personal content server
US817533018 août 20118 mai 2012Wistaria Trading, Inc.Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data
US81848496 juil. 201022 mai 2012Digimarc CorporationError processing of steganographic message signals
US818485112 avr. 201122 mai 2012Digimarc CorporationInserting watermarks into portions of digital signals
US819071321 juil. 201129 mai 2012Digimarc CorporationControlling a device based upon steganographically encoded data
US819479124 août 20095 juin 2012Omereen Wireless, LlcJoint, adaptive control of equalization, synchronization, and gain in a digital communications receiver
US820422213 sept. 200519 juin 2012Digimarc CorporationSteganographic encoding and decoding of auxiliary codes in media signals
US821417526 févr. 20113 juil. 2012Blue Spike, Inc.Method and device for monitoring and analyzing signals
US822470510 sept. 200717 juil. 2012Moskowitz Scott AMethods, systems and devices for packet watermarking and efficient provisioning of bandwidth
US822509914 avr. 201017 juil. 2012Wistaria Trading, Inc.Linear predictive coding implementation of digital watermarks
US822856331 mai 200524 juil. 2012Digimarc CorporationWatermarking a page description language file
US823855330 mars 20097 août 2012Wistaria Trading, IncSteganographic method and device
US826527622 déc. 200911 sept. 2012Moskowitz Scott AMethod for combining transfer functions and predetermined key creation
US826527821 sept. 201011 sept. 2012Blue Spike, Inc.System and methods for permitting open access to data objects and for securing data within the data objects
US827179511 sept. 200618 sept. 2012Blue Spike, Inc.Security based on subliminal and supraliminal channels for data objects
US828114023 nov. 20092 oct. 2012Wistaria Trading, IncOptimization methods for the insertion, protection, and detection of digital watermarks in digital data
US830027423 sept. 200830 oct. 2012Digimarc CorporationProcess for marking substrates with information using a texture pattern and related substrates
US830721321 juin 20106 nov. 2012Wistaria Trading, Inc.Method and system for digital watermarking
US832061112 juil. 201127 nov. 2012Digimarc CorporationWatermarking electronic text documents
US835551426 oct. 200715 janv. 2013Digimarc CorporationAudio encoding to convey auxiliary information, and media embodying same
US836936311 mai 20105 févr. 2013Digimarc CorporationWireless methods and devices employing plural-bit data derived from audio information
US839154126 oct. 20075 mars 2013Digimarc CorporationSteganographic encoding and detecting for video signals
US840577217 févr. 201026 mars 2013Koplar Interactive Systems International L.L.C.Method and system for enhanced modulation of video signals
US84675258 juin 201018 juin 2013Wistaria Trading, Inc.Steganographic method and device
US847374614 oct. 201125 juin 2013Scott A. MoskowitzMethods, systems and devices for packet watermarking and efficient provisioning of bandwidth
US852185021 juil. 201127 août 2013Digimarc CorporationContent containing a steganographically encoded process identifier
US852661119 mars 20123 sept. 2013Blue Spike, Inc.Utilizing data reduction in steganographic and cryptographic systems
US853801129 août 200617 sept. 2013Blue Spike, Inc.Systems, methods and devices for trusted transactions
US85428314 mai 201024 sept. 2013Scott A. MoskowitzMultiple transform utilization and application for secure digital watermarking
US854930527 oct. 20101 oct. 2013Wistaria Trading, Inc.Steganographic method and device
US86067157 mai 200810 déc. 2013Digimarc CorporationSystems and methods facilitating communication with remote computers
US861276525 mars 201217 déc. 2013Blue Spike, LlcSecurity based on subliminal and supraliminal channels for data objects
US870657017 juil. 201222 avr. 2014Scott A. MoskowitzMethods, systems and devices for packet watermarking and efficient provisioning of bandwidth
US871272813 mars 201329 avr. 2014Blue Spike LlcMethod and device for monitoring and analyzing signals
US87392957 mars 201227 mai 2014Blue Spike, Inc.Secure personal content server
US876796211 août 20121 juil. 2014Blue Spike, Inc.System and methods for permitting open access to data objects and for securing data within the data objects
US877421628 sept. 20108 juil. 2014Wistaria Trading, Inc.Exchange mechanisms for digital information packages with bandwidth securitization, multichannel digital watermarks, and key management
US878112113 mars 201315 juil. 2014Blue Spike, Inc.Utilizing data reduction in steganographic and cryptographic systems
US878920112 mars 201322 juil. 2014Blue Spike, Inc.Secure personal content server
US879813326 nov. 20085 août 2014Koplar Interactive Systems International L.L.C.Dual channel encoding and detection
US879826811 mars 20135 août 2014Blue Spike, Inc.System and methods for permitting open access to data objects and for securing data within the data objects
US884272528 déc. 200923 sept. 2014Koplar Interactive Systems International L.L.C.Mark-based content modulation and detection
US893071924 juil. 20126 janv. 2015Scott A. MoskowitzData protection method and device
US902160211 mars 201328 avr. 2015Scott A. MoskowitzData protection method and device
US907015112 mars 201330 juin 2015Blue Spike, Inc.Systems, methods and devices for trusted transactions
US910484224 août 200711 août 2015Scott A. MoskowitzData protection method and device
US917113617 nov. 201427 oct. 2015Wistaria Trading LtdData protection method and device
US919120522 avr. 201417 nov. 2015Wistaria Trading LtdMultiple transform utilization and application for secure digital watermarking
US919120622 avr. 201417 nov. 2015Wistaria Trading LtdMultiple transform utilization and application for secure digital watermarking
US92581167 mai 20149 févr. 2016Wistaria Trading LtdSystem and methods for permitting open access to data objects and for securing data within the data objects
US92708596 mai 201423 févr. 2016Wistaria Trading LtdUtilizing data reduction in steganographic and cryptographic systems
US96304432 mars 200425 avr. 2017Digimarc CorporationPrinter driver separately applying watermark and information
US963971719 août 20132 mai 2017Wistaria Trading LtdMethods, systems and devices for packet watermarking and efficient provisioning of bandwidth
US971066929 sept. 201518 juil. 2017Wistaria Trading LtdSecure personal content server
US20010010730 *2 févr. 20012 août 2001Rhoads Geoffrey B.Steganographic messaging through imagery
US20010029580 *22 févr. 200111 oct. 2001Moskowitz Scott A.Optimization methods for the insertion, protection, and detection of digital watermarks in digital data
US20020034297 *7 août 200121 mars 2002Rhoads Geoffrey B.Wireless methods and devices employing steganography
US20020036698 *20 sept. 200128 mars 2002Koichi MizutaniImage sensing device
US20020088570 *11 mai 200111 juil. 2002Sundaram V.S. MeenakshiOzone bleaching of low consistency pulp using high partial pressure ozone
US20020162118 *28 janv. 200231 oct. 2002Levy Kenneth L.Efficient interactive TV
US20030086585 *17 sept. 20028 mai 2003Rhoads Geoffrey B.Embedding auxiliary signal with multiple components into media signals
US20030103645 *21 oct. 20025 juin 2003Levy Kenneth L.Integrating digital watermarks in multimedia content
US20030142847 *16 oct. 200231 juil. 2003Rhoads Geoffrey B.Method for monitoring internet dissemination of image, video, and/or audio files
US20030219143 *18 févr. 200327 nov. 2003Moskowitz Scott A.Optimization methods for the insertion, protection, and detection of digital watermarks in digitized data
US20030228031 *26 févr. 200311 déc. 2003Rhoads Geoffrey B.Methods for marking images
US20040003394 *1 juil. 20021 janv. 2004Arun RamaswamySystem for automatically matching video with ratings information
US20040100588 *9 août 200227 mai 2004Hartson Ted E.Expanded information capacity for existing communication transmission systems
US20050018756 *7 juil. 200427 janv. 2005Custom One Design, Inc.Systems and methods for spread spectrum communication of supplemental information
US20050031159 *28 mai 200410 févr. 2005Rhoads Geoffrey B.Content objects with computer instructions steganographically encoded therein, and associated methods
US20050039021 *17 juin 200417 févr. 2005Alattar Adnan M.Watermarking electronic text documents
US20050047595 *9 juil. 20043 mars 2005Koplar Interactive Systems International, L.L.C.Method and system for enhanced modulation of video signals
US20050117776 *21 oct. 20042 juin 2005Digimarc CorporationImage marking adapted to the image
US20050135615 *30 déc. 200423 juin 2005Moskowitz Scott A.Z-transform implementation of digital watermarks
US20050147276 *7 mars 20057 juil. 2005Powell Robert D.Decoding hidden data from imagery
US20050177727 *7 févr. 200511 août 2005Moskowitz Scott A.Steganographic method and device
US20050195327 *31 mars 20058 sept. 2005Chupp Christopher E.Method and system for enhanced modulation of video signals
US20050204400 *11 mai 200515 sept. 2005Microsoft CorporationMethod and system for downloading and storing interactive device content using the horizontal overscan portion of a video signal
US20050251683 *14 juin 200510 nov. 2005Levy Kenneth LAudio/video commerce application architectural framework
US20050286948 *31 mai 200529 déc. 2005Walton Scott EWatermarking a page description language file
US20060080556 *25 oct. 200513 avr. 2006Rhoads Geoffrey BHiding and detecting messages in media signals
US20060109984 *3 janv. 200625 mai 2006Rhoads Geoffrey BMethods for audio watermarking and decoding
US20060120560 *14 nov. 20058 juin 2006Davis Bruce LData transmission by watermark proxy
US20060133645 *22 déc. 200522 juin 2006Rhoads Geoffrey BSteganographically encoded video, and related methods
US20060133646 *22 déc. 200522 juin 2006Rhoads Geoffrey BVideo steganography
US20060274198 *17 août 20067 déc. 2006Koplar Interactive Systems International Llcmethod and system for enhanced modulation of video signals
US20070019837 *28 sept. 200625 janv. 2007Powell Robert DImage Data Processing
US20070189533 *2 févr. 200716 août 2007Rhoads Geoffrey BWireless Methods And Devices Employing Steganography
US20070223592 *22 mai 200727 sept. 2007Rhoads Geoffrey BVideo Steganography or Encoding
US20070274386 *7 févr. 200729 nov. 2007Rhoads Geoffrey BMonitoring of Video or Audio Based on In-Band and Out-of-Band Data
US20070274523 *2 févr. 200729 nov. 2007Rhoads Geoffrey BWatermarking To Convey Auxiliary Information, And Media Embodying Same
US20070300072 *31 août 200727 déc. 2007Wistaria Trading, Inc.Optimization methods for the insertion, protection and detection of digital watermarks in digital data
US20080056351 *30 août 20076 mars 2008Koplar Interactive Systems International, L.L.C.Method and system for enhanced modulation of video signals
US20080109417 *26 déc. 20078 mai 2008Blue Spike, Inc.Method and device for monitoring and analyzing signals
US20080133927 *26 déc. 20075 juin 2008Wistaria Trading Inc.Method and system for digital watermarking
US20080134232 *22 oct. 20075 juin 2008Rhoads Geoffrey BMethods For Controlling Rendering of Images and Video
US20080215636 *7 mai 20084 sept. 2008Lofgren Neil ESystems and Methods Facilitating Communication with Remote Computers
US20080240599 *5 mars 20082 oct. 2008Tetsujiro KondoData processing device and method, recording medium, and program
US20080273747 *7 mai 20086 nov. 2008Rhoads Geoffrey BControlling Use of Audio or Image Content
US20090067672 *9 sept. 200812 mars 2009Rhoads Geoffrey BEmbedding Hidden Auxiliary Code Signals in Media
US20090097702 *16 déc. 200816 avr. 2009Rhoads Geoffrey BError Processing of Steganographic Message Signals
US20090132547 *14 oct. 200821 mai 2009Rhoads Geoffrey BSteganographic Encoding for Video and Audio
US20090141793 *26 nov. 20084 juin 2009Koplar Interactive Systems International, L.L.C.Dual channel encoding and detection
US20100141836 *17 févr. 201010 juin 2010Koplar Interactive Systems International, LlcMethod and system for enhanced modulation of video signals
US20100166083 *28 déc. 20091 juil. 2010Chupp Christopher EMark-based content modulation and detection
US20100296526 *11 mai 201025 nov. 2010Rhoads Geoffrey BWireless Methods and Devices Employing Plural-Bit Data Derived from Audio Information
US20110066734 *27 sept. 201017 mars 2011Rhoads Geoffrey BNetwork linking methods and apparatus
USRE4255820 févr. 200919 juil. 2011Omereen Wireless, LlcJoint adaptive optimization of soft decision device and feedback equalizer
USRE442224 juin 201214 mai 2013Scott MoskowitzMethods, systems and devices for packet watermarking and efficient provisioning of bandwidth
USRE443074 juin 201218 juin 2013Scott MoskowitzMethods, systems and devices for packet watermarking and efficient provisioning of bandwidth
EP0710022A3 *24 oct. 199526 août 1998AT&T Corp.System and method for encoding digital information in a television signal
EP0863505A2 *2 mars 19989 sept. 1998Sony CorporationMethod for superimposing and detecting additional information signal, method for detecting additional information signal, device for detecting additional information signal, and device for recording information signal
EP0863505A3 *2 mars 199823 juin 1999Sony CorporationMethod for superimposing and detecting additional information signal, method for detecting additional information signal, device for detecting additional information signal, and device for recording information signal
EP1968301A216 mai 199710 sept. 2008Digimarc CorporationComputer system linked by using information in data objects
WO1995024797A1 *7 mars 199514 sept. 1995Radio Telecom & Technology, Inc.Compatible interactive tv and multimedia delivery system
WO1996027264A1 *12 févr. 19966 sept. 1996Nielsen Media Research, Inc.Video and data co-channel communication system
WO2005020560A2 *26 août 20043 mars 2005Koplar Interactive Systems International, L.L.C.Method and system for enhanced modulation of video signals
WO2005020560A3 *26 août 20042 juin 2005Christopher E ChuppMethod and system for enhanced modulation of video signals
Classifications
Classification aux États-Unis348/473, 386/E05.004, 348/E07.024
Classification internationaleH04N5/913, H04N7/08
Classification coopérativeH04N5/913, H04N7/08, H04N2005/9135
Classification européenneH04N5/913, H04N7/08
Événements juridiques
DateCodeÉvénementDescription
20 déc. 1991ASAssignment
Owner name: A. C. NIELSEN COMPANY, ILLINOIS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:DEJEAN, JEAN P.;LU, DAOZHENG;WEISSMAN, ROBERT;REEL/FRAME:005969/0858;SIGNING DATES FROM 19911122 TO 19911203
24 févr. 1997FPAYFee payment
Year of fee payment: 4
7 juil. 1997ASAssignment
Owner name: NIELSEN MEDIA RESEARCH, INC., A DELAWARE CORP., NE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:A.C. NIELSEN COMPANY;REEL/FRAME:008587/0164
Effective date: 19970127
15 févr. 2001FPAYFee payment
Year of fee payment: 8
23 mars 2005REMIMaintenance fee reminder mailed
7 sept. 2005LAPSLapse for failure to pay maintenance fees
1 nov. 2005FPExpired due to failure to pay maintenance fee
Effective date: 20050907